📊 Finance calculator

Debt-to-Income Ratio Calculator

Calculate your front end and back end debt to income ratio, see how it compares to common mortgage lending guidelines, and check how much more debt realistically fits your budget.

Front end ratio Back end ratio Mortgage qualification

Reviewed: June 2026

By CalcMora Editorial Team

Calculate your debt to income ratio

Choose whether you want your current DTI, or how much more debt you can add.

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Gross monthly income

Monthly housing payment

Other monthly debt payments

Back end DTI ratio 35.8%

Total monthly debt payments as a share of gross monthly income.

Front end ratio 25%

Back end ratio 35.8%

Total monthly debt $2,150

Qualification tier Good

Excellent Good Borderline High risk

Step by step work

Debt-to-Income Ratio Calculator: back end DTI of 35.8% on $6,000 gross monthly income.

Quick examples

Free to use

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Regularly updated

100% private — no data stored

How to use this debt to income ratio calculator

Choose your mode

Pick whether you want your current DTI, or how much more debt fits your budget.

Enter your income

Use your gross monthly income, before taxes and other deductions.

Enter your debts

Add your housing payment and every other fixed monthly debt obligation.

Review your tier

Check your ratio against common lender guidelines and the step by step math.

What is a debt to income ratio calculator?

A debt to income ratio calculator estimates what percentage of your gross monthly income is already committed to debt payments. Lenders use this figure, commonly shortened to DTI, as one of the main factors in deciding how much you can borrow for a mortgage, auto loan, or other major financing.

This calculator works in two directions. It can calculate your current DTI from your income and existing debts, or it can work backward from a target DTI to show how much additional monthly debt payment would still keep you within that target.

Debt to income ratio formula

The back end DTI formula, which most lenders rely on most heavily, is straightforward once your monthly numbers are gathered.

Back end DTI = Total monthly debt payments ÷ Gross monthly income × 100

Front end DTI uses the same structure but only counts housing costs in the numerator, which gives lenders a separate view of how much of your income goes specifically toward where you live before any other debts are added in.

Front end DTI = Monthly housing payment ÷ Gross monthly income × 100

Common DTI thresholds lenders use

While exact limits vary by lender and loan program, a back end DTI of 36 percent or lower is widely viewed as strong, and many conventional loan programs treat 43 percent as a common upper limit for a qualified mortgage. Some government backed loan programs allow higher ratios, sometimes into the high 40s or beyond, particularly alongside strong compensating factors like a high credit score or a large down payment.

Front end DTI guidelines are typically stricter, often capped around 28 percent, since housing alone is expected to take up a smaller share of income than total debt combined.

Why lenders care about DTI so much

DTI gives lenders a quick sense of how much financial breathing room a borrower has. A low DTI suggests more of your income is available to absorb a new payment comfortably, while a high DTI suggests a new loan payment would stretch your budget thin, increasing the risk that a missed paycheck or unexpected expense could lead to a missed payment.

This is also why DTI is checked alongside credit score and down payment size rather than in isolation. A strong credit history can sometimes offset a higher DTI, and a larger down payment can reduce the loan amount needed, both of which shift a lender's overall risk assessment even when the DTI number itself stays the same.

Where this fits with your broader borrowing plans

A DTI check rarely happens on its own. If you are specifically working toward a home purchase, the Mortgage Calculator can turn an approved loan amount into an actual estimated monthly payment, including taxes, insurance, and PMI, which you can then feed back into this calculator to see the effect on your DTI before you commit to an offer.

If you are still deciding whether buying makes more sense than renting right now, the Rent vs Buy Calculator compares the two paths directly, which pairs naturally with a DTI check since your housing decision is usually the single largest input in this calculator's front end ratio. And if one of your existing debts is an installment loan with a fixed monthly payment, the Loan EMI Calculator can help you confirm the exact monthly figure to enter here, rather than estimating it.

Since gross monthly income is the denominator in every DTI calculation, it is worth double checking that figure too. If your pay comes as an annual salary or a different pay period, the Salary to Hourly Calculator can help you convert it into a clean monthly gross figure before you run the numbers here.

A full worked example

Say a borrower has a gross monthly income of 6,000 dollars, a housing payment of 1,500 dollars, and 650 dollars in other monthly debts, made up of a car loan and two credit card minimum payments. The front end ratio comes from dividing the housing payment alone by income, 1,500 divided by 6,000, which works out to exactly 25 percent, well inside most lenders' front end comfort zone.

The back end ratio adds the other 650 dollars in debt to the housing payment first, giving a total monthly debt figure of 2,150 dollars. Dividing that by the same 6,000 dollar income produces a back end DTI of roughly 35.8 percent, which lands this borrower in the strong or excellent range under most common lending guidelines, close to but still under the widely referenced 36 percent benchmark.

Now suppose that same borrower is shopping for a new car and wants to know how large a monthly payment still keeps them under a 43 percent back end DTI, a common ceiling for many mortgage programs. Using the second mode of this calculator, 43 percent of 6,000 dollars is 2,580 dollars in total allowed debt. Subtracting the existing 650 dollars in other debt leaves 1,930 dollars of room, but since the housing payment of 1,500 dollars also counts toward that same back end figure, the borrower actually has only 430 dollars of genuinely new room for a car payment before crossing the 43 percent line.

Frequently asked questions

What is a debt to income ratio?

A debt to income ratio, usually shortened to DTI, is the percentage of your gross monthly income that goes toward paying debts each month. It is calculated by dividing your total monthly debt payments by your gross monthly income, then multiplying by 100. Lenders use this number to judge how much of your income is already committed before you take on new debt.

What is the difference between front end and back end DTI?

Front end DTI only counts housing costs, such as your rent or mortgage payment, property taxes, and homeowners insurance, divided by your gross income. Back end DTI counts every monthly debt payment, including housing, car loans, student loans, credit cards, and other obligations. Mortgage lenders typically look at both numbers together.

What is a good debt to income ratio?

Many lenders consider a back end DTI of 36 percent or lower to be strong, 37 to 43 percent to be acceptable for many loan programs, and above 43 percent to be a higher risk that may limit loan options or require a larger down payment. Some loan programs allow higher ratios under certain conditions, so exact limits vary by lender and loan type.

Does DTI include my own spending, like groceries or entertainment?

No. DTI only counts fixed debt obligations that appear on your credit report or are otherwise contractually required, such as loan payments, minimum credit card payments, and housing costs. Everyday spending on groceries, utilities, entertainment, and similar categories is not included in a standard DTI calculation.

Should I use gross income or net income for this calculation?

Use gross income, meaning your income before taxes and other deductions are taken out. Lenders calculate DTI using gross income because it standardizes the comparison across borrowers with different tax situations, even though your actual take home pay after taxes will always be lower than the gross figure used here.

How can I lower my debt to income ratio?

You can lower your DTI by paying down or paying off existing debts, avoiding new debt before a major loan application, or increasing your gross income. Paying off a car loan or a credit card balance entirely, rather than making minimum payments, often has a bigger and faster impact than making extra payments spread across several debts.

Is a low DTI the only thing lenders check?

No. DTI is one of several factors lenders review alongside credit score, employment history, down payment size, and loan type. A strong DTI improves your approval odds and loan terms, but a favorable outcome still depends on the full picture a lender evaluates, not this ratio in isolation.

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Disclaimer

This tool is for educational purposes only. Always verify important results with a qualified professional.

Mizan

Founder, CalcMora

Building a growing library of free calculators to help people make smarter everyday decisions.

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